飛行機がくるくるまわるメリーゴーランドなiPhoneアプリのサンプルコードを描いてみます。
#import “ViewController.h”
@import SceneKit;
@interface ViewController () <SCNSceneRendererDelegate>
@property (nonatomic, weak) SCNScene *scene;
@property (nonatomic) NSTimeInterval last;
@property (nonatomic) float phi;
@property (nonatomic, strong) NSMutableArray *planesSlider;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor lightGrayColor];
[self setupScene];
for (int i=0; i<4; i++) {
[self createPlane:[UIColor colorWithHue:0.3 * i saturation:0.5 brightness:1 alpha:1] name:[NSString stringWithFormat:@”plane%d”, i]];
}
[self createCamera];
[self createLight];
[self createController];
}
– (void)setupScene {
float w = CGRectGetMaxX(self.view.bounds);
SCNView *sv = [[SCNView alloc] initWithFrame:CGRectMake(0, 0, w, w)];
sv.backgroundColor = [UIColor colorWithHue:0.45 saturation:0.3 brightness:1 alpha:1];
sv.scene = [SCNScene scene];
sv.delegate = self;
[self.view addSubview:sv];
self.scene = sv.scene;
}
– (void)createPlane:(UIColor*)color name:(NSString*)name{
SCNNode *plane = [SCNNode node];
plane.name = name;
[self.scene.rootNode addChildNode:plane];
[plane runAction:[SCNAction rotateByAngle:-M_PI/2.0 aroundAxis:SCNVector3Make(1, 0, 0) duration:2.0]];
SCNCylinder *body = [SCNCylinder cylinderWithRadius:0.5 height:3];
body.firstMaterial.diffuse.contents = color;
SCNNode *bodyNode = [SCNNode nodeWithGeometry:body];
[plane addChildNode:bodyNode];
SCNBox *wing = [SCNBox boxWithWidth:3 height:1 length:0.3 chamferRadius:1];
wing.firstMaterial.diffuse.contents = color;
SCNNode *wingNode = [SCNNode nodeWithGeometry:wing];
wingNode.position = SCNVector3Make(0, 0.4, 0.2);
[plane addChildNode:wingNode];
SCNBox *tail = [SCNBox boxWithWidth:0.3 height:1 length:1 chamferRadius:1];
tail.firstMaterial.diffuse.contents = color;
SCNNode *tailNode = [SCNNode nodeWithGeometry:tail];
tailNode.position = SCNVector3Make(0, –1.5, 0.5);
[plane addChildNode:tailNode];
SCNBox *propeller = [SCNBox boxWithWidth:2 height:0.2 length:0.4 chamferRadius:1];
propeller.firstMaterial.diffuse.contents = color;
SCNNode *propellerNode = [SCNNode nodeWithGeometry:propeller];
propellerNode.position = SCNVector3Make(0, 2, 0);
[plane addChildNode:propellerNode];
[propellerNode runAction:[SCNAction repeatActionForever:[SCNAction rotateByAngle:0.2 aroundAxis:SCNVector3Make(0, 1, 0) duration:0.1]]];
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, –2, 30);
[self.scene.rootNode addChildNode:camera];
}
– (void)createLight {
SCNLight *light = [SCNLight light];
light.type = SCNLightTypeOmni;
SCNNode *lightNode = [SCNNode node];
lightNode.light = light;
lightNode.position = SCNVector3Make(0, 5, 60);
[self.scene.rootNode addChildNode:lightNode];
}
– (void)createController {
self.planesSlider = [NSMutableArray array];
for (int i=0; i<4; i++) {
UISlider *slider = [[UISlider alloc] init];
slider.minimumValue = 0;
slider.maximumValue = M_PI/2.0;
[slider sizeToFit];
slider.center = CGPointMake((i+1) * CGRectGetMaxX(self.view.bounds) / 5.0, CGRectGetMidY(self.view.bounds) + 100);
slider.transform = CGAffineTransformMakeRotation(-M_PI/2.0);
[self.view addSubview:slider];
UIImage *img = [self imageWithColor:[UIColor colorWithHue:i * 0.3 saturation:0.6 brightness:1 alpha:1]];
[slider setThumbImage:img forState:UIControlStateNormal];
[self.planesSlider addObject:slider];
}
}
– (UIImage *)imageWithColor:(UIColor *)color
{
CGRect rect = CGRectMake(0, 0, 40, 40);
UIGraphicsBeginImageContext(rect.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(ctx, color.CGColor);
CGContextFillRect(ctx, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
– (void)renderer:(id<SCNSceneRenderer>)aRenderer updateAtTime:(NSTimeInterval)time
{
float r = 15;
float dAnble = M_PI / 10.0;
self.phi = (time – self.last) * dAnble;
for (int i=0; i<4; i++) {
float phi = self.phi + i * M_PI/2.0;
SCNNode *plane = [self.scene.rootNode childNodeWithName:[NSString stringWithFormat:@”plane%d”, i] recursively:NO];
plane.transform = SCNMatrix4MakeRotation(-M_PI/2.0, 1, 0, 0);
plane.transform = SCNMatrix4Rotate(plane.transform, M_PI – phi, 0, 1, 0);
float theta = M_PI * 0.7 – ((UISlider*)self.planesSlider[i]).value;
plane.position = [self sphericalCoordinateTheta:theta phi:phi r:r];
}
}
– (SCNVector3)sphericalCoordinateTheta:(float)theta phi:(float)phi r:(float)r {
float x = r * sin(theta) * cos(phi);
float z = r * sin(theta) * sin(phi);
float y = r * cos(theta);
return SCNVector3Make(x, y, z);
}
@end